Light emitting roller for roller skates

ABSTRACT

A light emitting roller for roller skates, including a roller body having a center axle hole for mounting on a wheel axle, an annular groove around said center axle hole at an outer side, a battery chamber and two opposite through holes at said annular groove; an annular circuit board mounted within the annular groove on the roller, having a plurality of light emitting elements controlled to emit light through the through holes on the roller body, an automatic switch, an opening, two contact metal plates at two opposite sides of the opening, and a battery cell connected between the contact metal plates and mounted within the battery chamber on the roller to provide electric power supply to the light emitting elements through the automatic switch; and an annular cap mounted within the annular groove on the roller to hold down the annular.

BACKGROUND OF THE INVENTION

The present invention relates to a light emitting roller for roller skates which automatically drive the light emitting diodes thereof to flash when rotated during skating.

Skating on roller skates is a sports game invited by young children. Roller skates with light emitting rollers have been developed. These roller skates emit light when they are moving. FIG. 1 shows a light emitting roller according to the prior art which comprises a battery cell mounted within a battery chamber on the roller body thereof, a manual switch mounted within a hole on the roller body, and a series of light emitting diodes mounted in a respective hole on an annular groove on the roller Body and connected in series to the two opposite terminals of the battery cell through the manual switch. When the manual switch is switched on, electric circuit is closed, and therefore the light emitting diodes are turned on to give off light. Because the light emitting diodes are controlled by the manual switch, they keep consuming battery power supply when the manual switch is switched on. Furthermore, because the manual switch is disposed outside the roller body for operation by hand, the installation of the manual switch destroys the sense of beauty of the roller skate.

SUMMARY OF THE INVENTION

The present invention provides a light emitting roller for roller skates which comprises a roller body having a center axle hole for mounting on a wheel axle, an annular groove around said center axle hole at an outer side, a battery chamber and two opposite through holes at said annular groove; an annular circuit board mounted within the annular groove on the roller, having a plurality of light emitting elements controlled to emit light through the through holes on the roller body, an automatic switch, an opening, two contact metal plates at two opposite sides of the opening, and a battery cell connected between the contact metal plates and mounted within the battery chamber on the roller to provide electric power supply to the light emitting elements through the automatic switch; and an annular cap mounted within the annular groove on the roller to hold down the annular. When the roller is rotated during skating, the automatic switch is intermittently switched on, causing the light emitting elements driven to flash. When the roller is stopped, the automatic switch is automatically switched off to cut off power supply from the light emitting elements. Because all component parts are covered within the annular groove on the roller body by the annular cap, the sense of beauty of the roller skate is maintained intact.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a light emitting roller according to the prior art;

FIG. 2 is an elevational view of a light emitting roller according to the present invention;

FIG. 3 is an exploded view of the light emitting roller shown in FIG. 2;

FIG. 4 is a side view in section of the light emitting roller shown in FIG. 2;

FIG. 5 is a perspective front view of the light emitting roller shown in FIG. 2; and

FIG. 6 is a circuit diagram according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 2, 3, and 4, the roller, referenced by 50, comprises a center axle hole 60 for mounting on a wheel axle (not shown), an annular groove 71 around the center axle hole 60 at an outer side, a battery chamber 711 and two opposite through holes 712 and 713 and two opposite retaining holes 51 and 52 at the annular groove 71. An annular circuit board 80 is mounted within the annular groove 71 on the roller 50, comprising a plurality of light emitting elements 81, an automatic switch 82 with two rolling balls 821 and 822 (see FIG. 5), an opening A at a suitable location, two contact metal plates 83 and 84 at two opposite sides by the opening A, and a battery cell 85 connected between the contact metal plates 83 and 84 and mounted within the battery chamber 711. An annular cap 90 is mounted within the annular groove 71 on the roller 50 to hold down the annular circuit board 80, having two mounting hooks 91 and 92 respectively hooked on the retaining holes 51 and 52. When installed, it is not necessary to control the automatic switch 82 in turning on the light emitting elements 81. When the roller 50 is moved during skating, the automatic switch 82 will be automatically and intermittently switched on to drive the light emitting elements 81, causing them to flash.

Referring to FIG. 5, the automatic switch 82 has two rolling balls 821 and 822 on the inside, which automatically switch on the electric circuit when they contact each other. As illustrated in FIG. 6, IC is connected to battery cell (namely, 85) and light emitting diodes D1, D2 and D3 (they can be of different colors), and a resistor R1 is optionally installed to increase the flashing frequency of the light emitting diodes D1, D2 and D3. When the positive ball 821 contacts the negative ball 822, SW1 is triggered to drive IC, causing D1, D2 and D3 to flash for a predetermined length of time. When the balls 821 and 822 contact each other again, IC is triggered to drive D1, D2 and D3, causing them to flash again. This procedure is repeated again and again while skating. When the roller 50 is turned around the axis of the center axle hole 60, the balls 821 and 822 are forced to move relative to each other, causing the light emitting elements 81 to flash continuously (because the time in which the balls 821 and 822 are separated from each other during skating is shorter than one flashing cycle of the light emitting elements 81 (D1, D2 and D3) controlled by the aforesaid IC. When the roller 50 is stopped, the balls 821 and 822 are retained separated from each other, therefore the light emitting elements 81 are turned off.

While only one embodiment of the present invention has been shown and described, it will be understood that various modifications and changes could be made thereunto without departing from the spirit and scope of the invention. 

I claim:
 1. A light emitting roller for roller skates, comprising:a roller body having a center axle hole for mounting on a wheel axle, an annular groove around said center axle hole at an outer side, a battery chamber and two opposite through holes at said annular groove; an annular circuit board mounted within said annular groove on said roller, said annular circuit board comprising a plurality of light emitting elements controlled to emit light through the through holes on said roller body, an automatic switch, an opening, two contact metal plates at two opposite sides of said opening, and a battery cell connected between said contact metal plates and mounted within said battery chamber on said roller to provide electric power supply to said light emitting elements through said automatic switch; and an annular cap mounted within said annular groove on said roller to hold down said annular circuit board.
 2. The light emitting roller of claim 1 wherein said roller body further comprises a plurality of retaining holes within said annular groove; said annular cap has a plurality of mounting hooks respectively hooked in said retaining holes on said roller body.
 3. The light emitting roller of claim 1 wherein said automatic switch comprises a control IC, two metal rolling balls connected in series to said control IC and said light emitting diodes and moved relative to each other to turn on said control IC when they contact each other, causing said light emitting diodes to flash for a predetermined length of time.
 4. The light emitting roller of claim 3 wherein said automatic switch further comprises a resistor connected between two opposite ends of said IC to increase the flashing frequency of said light emitting elements. 